摘要
轨道角动量(Orbital Angular Momentum,OAM)复用是提高声学通信系统数据容量的一种潜在解决方案,提出一种利用声学超表面对OAM复用信号进行调制和解调的方法,利用该方法对独立声轨道角动量(Acoustic Orbital Angular Momentum,AOAM)信号的幅度和相位进行分析,并通过仿真实现对AOAM信号的调制和解调.AOAM信号的相位和幅度提供正交自由度,通过设计合适的声学超表面并将其与二进制差分相位编码技术相结合,证明其可以实现AOAM复用信号的有效调制和解调.正交声学螺旋模态可防止模式耦合和串扰,从而增强声学多路复用.基于谐振的结构提供信号频率选择性,提高了交互效率,简化了终端设备,便于实现大容量声学通信系统的创建.
Abstract
Orbital angular momentum(OAM)multiplexing has been suggested as a potential solution to increase the data capacity of acoustic communication systems.A method of modulation and demodulation of OAM multiplexed signals using acoustic metasurfaces is proposed in this manuscript.The amplitude and phase of independent acoustic orbital angular momentum(AOAM)multiplexed signal provide orthogonal degrees of freedom.By designing appropriate acoustic metasurfaces and combining them with binary differential phase coding techniques,we demonstrated that efficient modulation and fast demodulation of AOAM multiplexed signals can be achieved.Orthogonal acoustic spiral modes prevent mode coupling and crosstalk,enhancing acoustic multiplexing.The resonance-based structure provides signal frequency selectivity,boosting efficiency and simplifying terminal equipment for practical applications,which leads to the creation of high-capacity acoustic communication systems.
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